fpga: dfl-cxl-cache: flush cache for new NUMA buffer mapping

To avoid caching conflicts between the Acceleration Functional Unit in the dfl-cxl-cache and the host processor, flush the cache for newly mapped NUMA buffers. Signed-off-by: Matthew Gerlach <[email protected]> (cherry picked from commit f3fef7fec30a1c9dc08e293c6ae1c38b5b90db6e)
OFS · Dec 13, 2023 · cf1af08 · cf1af08
1 parent c41b7d8
commit cf1af08
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/fpga/dfl-cxl-cache.c b/drivers/fpga/dfl-cxl-cache.c
@@ -308,6 +308,8 @@ static long cxl_cache_ioctl_numa_buffer_map(struct dfl_cxl_cache *cxl_cache, voi
 		goto out_unpin_pages;
 	}
 
+	clflush_cache_range(page_address(region->pages[0]), region->length);
+
 	region->phys = page_to_phys(region->pages[0]);
 
 	for (i = 0; i < DFL_ARRAY_MAX_SIZE; i++) {